Opus
Dei was founded in 1928 in Spain by a priest by the name of Josemaria
Escriva(above), later to be canonized as a saint, and is now practiced
in 61 countries worldwide. In Dan Brown's novel, the Catholic
institution is looked upon in a very negative way, almost as far as
displaying it as an institution composed completely of evil villains.
In the novel there is much talk about "corporal mortification", the act
of inflicting pain and suffering on oneself as a constant reminder of
Christ's sacrifice. The most commonly used device for this
mortification is the "Cilice Belt", pictured above, which is a metal
spiked device worn around the thigh constantly causing pain. On their
official website Opus Dei denies taking part in bloody mortifications,
only later saying that some of it's members have used the Cilice. This
doesn't seem linear to me and just adds to some proof that perhaps some
of what Dan Brown had stated in his novel was true. Brown has been
quoted saying that his novel is indeed fiction but that it is based on
many historical facts.
"All descriptions of artwork, architecture, documents, and secret rituals in this novel are accurate." -Dan Brown
"The Vatican prelature know as Opus Dei is a deeply devout Catholic sect that has been the topic of recent controversy due to reports of brain-washing, coercion, and a dangerous practice known as "corporal mortification." Opus Dei has just completed construction of a $47 million National Headquarters at 243 Lexington Avenue in New York City." -Dan Brown
For more information on Opus Dei check out the link below.